Diffraction glasses are an inexpensive & simple way to determine whether circadian blue is emitted by a yellowish or white light.
How can you tell if lights emit harmful blue wavelengths at night?
How can you tell if lights emit harmful blue…
How can you tell if lights emit harmful blue wavelengths at night?
Diffraction glasses are an inexpensive & simple way to determine whether circadian blue is emitted by a yellowish or white light.